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([2600:8803:e7e4:500:6526:8577:6be9:cb7b]) by smtp.gmail.com with ESMTPSA id 46e09a7af769-7e944007d7fsm7005358a34.2.2026.06.22.12.42.56 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 22 Jun 2026 12:42:57 -0700 (PDT) Message-ID: Date: Mon, 22 Jun 2026 14:42:56 -0500 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC v2 2/3] dt-bindings: iio: adc: Add excitation current sources properties To: Kurt Borja , Jonathan Cameron , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: =?UTF-8?Q?Nuno_S=C3=A1?= , Andy Shevchenko , linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260622-new-channel-props-v2-0-aafd5369f253@gmail.com> <20260622-new-channel-props-v2-2-aafd5369f253@gmail.com> Content-Language: en-US From: David Lechner In-Reply-To: <20260622-new-channel-props-v2-2-aafd5369f253@gmail.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 6/22/26 2:30 PM, Kurt Borja wrote: > Some ADCs incorporate current sources that provide excitation current to > resistive temperature devices (RTDs), thermistors, diodes and other > resistive sensors that require constant current biasing. > > Signed-off-by: Kurt Borja > --- > Documentation/devicetree/bindings/iio/adc/adc.yaml | 19 +++++++++++++++++++ > 1 file changed, 19 insertions(+) > > diff --git a/Documentation/devicetree/bindings/iio/adc/adc.yaml b/Documentation/devicetree/bindings/iio/adc/adc.yaml > index fdad6b8276c934c..160a8cfa9842a86 100644 > --- a/Documentation/devicetree/bindings/iio/adc/adc.yaml > +++ b/Documentation/devicetree/bindings/iio/adc/adc.yaml > @@ -86,6 +86,25 @@ properties: > source. If two values are provided, the first one corresponds to the > positive source and the second to the negative source. > > + excitation-channels: > + $ref: /schemas/types.yaml#/definitions/uint32-array > + description: > + Excitation current sources provide current to resistive temperature > + devices (RTDs), thermistors, diodes and other resistive sensors that > + require constant current biasing. > + > + This array describes the mux configuration of the excitation current > + sources. > + > + excitation-current-microamp: As seen in adi,ltc2983.yaml, this actually needs to be nanoamp to be able to be flexible for all parts. > + description: > + Excitation current sources provide current to resistive temperature > + devices (RTDs), thermistors, diodes and other resistive sensors that > + require constant current biasing. > + > + This array describes the current configuration of the excitation current > + sources or the single matched current for all sources. > + > anyOf: > - oneOf: > - required: >